with child vs gravid

with child and gravid both are adjectives.

Word	Noun	Adjective	Verb	Adverb
with child	No	Yes	No	No
gravid	No	Yes	No	No

As adjectives, with child and gravid are synonyms defined as:

Other synonyms of with child include big, enceinte, expectant, great, heavy, large.

with child (adjective)	gravid (adjective)
in an advanced stage of pregnancy	in an advanced stage of pregnancy