parent vs family unit

parent and family unit both are nouns.

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

parent (noun)	family unit (noun)
an organism (plant or animal) from which younger ones are obtained	primary social group; parents and children
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

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