family unit vs parent

family unit and parent both are nouns.

Word	Noun	Adjective	Verb	Adverb
family unit	Yes	No	No	No
parent	Yes	No	Yes	No

family unit (noun)	parent (noun)
primary social group; parents and children	an organism (plant or animal) from which younger ones are obtained
	a father or mother; one who begets or one who gives birth to or nurtures and raises a child; a relative who plays the role of guardian

family unit (verb)	parent (verb)
	look after a child until it is an adult