biological science vs propagate

biological science is a noun but propagate is not a noun.

Word	Noun	Adjective	Verb	Adverb
biological science	Yes	No	No	No
propagate	No	No	Yes	No

biological science (noun)	propagate (noun)
the science that studies living organisms

biological science (verb)	propagate (verb)
	multiply sexually or asexually
	cause to propagate, as by grafting or layering
	cause to become widely known
	transmit
	transmit or cause to broaden or spread
	become distributed or widespread
	travel through the air
	transmit from one generation to the next