Here is a test i did a while back, i recently bought new flours I haven't tried yet so i will have to test these also. I will be double testing the ones i did this time again also, because, it can't hurt to have 2 comparisons!
I noted the taste, texture and any notes and possible uses for each according to my individual taste buds and preferences and (not so) educated guesses. General notes. All the white ones are starchy in behaviour. They act as a liquid when there's enough water, but when it's thick (ish, still runny) and given resistance it turns into a solid- it's confused. AND they all appear clearish, wet and squishy at the bottom and edges, and crunchy, dry, white and powdery in the center and top. I mixed all starchy flours to a pourable consistency. And i mixed the others to a moist instant potato mash consistency, so when i stirred the spoon the flour would cave in immediately instead of sticking to the spoon and showing the bottom of the plate. So all were "pourable" to an extend even though the denser ones needed help being pushed out of the bowl. I thought the more moisture the better. I now see i may have over cooked them and added far too much starch to the "pourable" mixtures as cooking showed the extent to which how little i needed.
Arrowroot Flour
Taste- bland. Not unpleasantness at all, similar to wheat.
Texture- Really chewy and clear with enough water, or crunchy dry on top.
Uses- sweet or savoury, perfect for bread as it imparts no flavour.
Notes- needed more water.
Glutinous Rice Flour
Taste- Bland, like rice with a very slight bitterness? or Sour...something unpleasant. But only very slight, very tolerable.
Texture - SOFT and squidgy- not squishy.
Notes - warped on itself. Undercooked or too much water.
Uses- Savoury or Bread. Maybe sweets.
Sorghum Flour
Taste- Bland, nutty, slight sour, reminiscent of wheat bix.
Texture- slightly dense, crumbly, crackly, heavy-sticks in your mouth.
Notes- ALLERGIC reaction, red sore irritated itch lip, itchy tongue throat and mouth for about 30 minutes.
Uses- Anything i think. Be probably much better for sweets and muffins and things. Bread mix too.
Buckwheat
Taste- Has a tang/zang to it, reminds me of fruit. Sour? Slightly nutty. Ok.
Texture- Dense, holds well
Notes- Purplish colour? Fiberous.
Uses- Fruit loaves or fruit muffin type things. The taste would work well with fruit.
Potato Starch
Taste- Bland
Texture- Hard, calamari-chewy, dense
Notes- starchy (see explanation above)
Uses- Bread, sweet or savoury.
Green Bean Flour
Taste- Beany, pretty gross. Not a fan, in a mix might be ok.
Texture- Falls apart, soft
Notes- Smells nutty/beany
Uses- SAVOURY only
White Rice Powder (Note: Not a flour!)
Taste- Rice like, bland
Texture- Crumbly, soft, falls apart
Notes- Soft, dry centre
Uses- Bread, savoury or sweet.
Chickpea Flour (gram)
Taste- Nutty, SOUR aftertaste, Ew
Texture- Dense, hard
Notes- Smells like Taco, Bubbly top, Needs sugar or Salt
Uses- Savoury
Millet
Taste- Sour, seedish, not nice, ew
Texture- Crumbly
Notes- curled inwards, smells deceptively sweet, grey in colour.
Uses- i don't think i want to cook with this based on the taste, but i've cooked sweet things in the past and it worked yummy tasting
Corn Starch
Taste- Weird, bland, slightly oceanic but tolerable
Texture- Crumbly, hard
Notes- I think i didn't have enough water, starchy
Uses- savoury or sweet, better in sweet because of the blandness and sugar would hide the slight weird taste
Tapioca Flour
Taste- PLEASANT! Bland, tastes like nothing. I LOVE IT!
Texture- Squidgy, tough, chewy gel
Notes- Smells sweet, starchy
Uses- savoury or sweet, especially sweet, or breads!
Tapioca Starch
Taste- A mouthful of millipedes marinated in ocean water in a metallic bowl. Truely. NASTY!!!! EW!
Texture- dense squidgy
Notes- I threw it in the bin. Smells like ocean marinated millipedes
Uses- NEVER AGAIN!
Sago Flour
Taste- Bland, hint of sweet and bitter/sour. Weird, ok.
Texture- VERY Dense, chewy, slightly squidge to it, starch like also.
Notes- None.
Uses- Sweets only, perhaps in bread...
Corn Flour (meal ?)
Taste- YUMO! but with a sour after taste, nutty also
Texture- VERY Crumbly, dense with some squidge
Notes- yellow
Uses- sweet or savoury, sweets would probably work better as it is sweeter, but corn seems to match better with savoury. Tacos...
New flours:
Teff, Red Sorghum, Lentil Flour, Soya Flour, Singhara Atta (Water chestnut) [starch]
Next time I'll buy Urid flour (black lentil/bean) that I saw there.