difficult to distinguish can nice difficult to smell in something else
unpleasant_taste is tangible_thing. odorless_thing is tangible_thing. strong_odor is tangible_thing. clean is tangible_thing. smell is sensation. pleasant_odor is tangible_thing. smelling_not_there is hallucination. sweet_odor is tangible_thing. weak_odor is tangible_thing. smell is important_sense.