depressed vs biology

depressed is not a noun while biology is a noun.

Word	Noun	Adjective	Verb	Adverb
depressed	No	Yes	No	No
biology	Yes	No	No	No

depressed (noun)	biology (noun)
	the science that studies living organisms
	all the plant and animal life of a particular region
	characteristic life processes and phenomena of living organisms

depressed (adjective)	biology (adjective)
filled with melancholy and despondency
lower than previously
flattened downward as if pressed from above or flattened along the dorsal and ventral surfaces