godchild vs infant

godchild and infant both are nouns.

Word	Noun	Adjective	Verb	Adverb
godchild	Yes	No	No	No
infant	Yes	No	No	No

As nouns, infant is a hypernym of godchild; that is, infant is a word with a broader meaning than godchild:

godchild: an infant who is sponsored by an adult (the godparent) at baptism
infant: a very young child (birth to 1 year) who has not yet begun to walk or talk

Other hypernyms of godchild include babe, baby.

godchild (noun)	infant (noun)
an infant who is sponsored by an adult (the godparent) at baptism	a very young child (birth to 1 year) who has not yet begun to walk or talk