biology vs obligate

biology is a noun but obligate is not a noun.

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

biology (noun)	obligate (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

biology (adjective)	obligate (adjective)
	restricted to a particular condition of life

biology (verb)	obligate (verb)
	bind by an obligation; cause to be indebted
	commit in order to fulfill an obligation
	force somebody to do something