child vs kid

child and kid both are nouns.

Word	Noun	Adjective	Verb	Adverb
child	Yes	No	No	No
kid	Yes	No	Yes	No

As nouns, child and kid are synonyms defined as:

Other synonyms of child include fry, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster.

As nouns, child and kid are synonyms defined as:

child (noun)	kid (noun)
a young person of either sex	young goat
a human offspring (son or daughter) of any age	a young person of either sex
an immature childish person	a human offspring (son or daughter) of any age
a member of a clan or tribe	soft smooth leather from the hide of a young goat

child (verb)	kid (verb)
	be silly or tease one another
	tell false information to for fun