vegetable garden vs vegetable patch

vegetable garden and vegetable patch both are nouns.

Word	Noun	Adjective	Verb	Adverb
vegetable garden	Yes	No	No	No
vegetable patch	Yes	No	No	No

As nouns, vegetable garden and vegetable patch are synonyms defined as:

vegetable garden and vegetable patch: a small garden where vegetables are grown

Other synonyms of vegetable garden include kitchen garden.

vegetable garden (noun)	vegetable patch (noun)
a small garden where vegetables are grown	a small garden where vegetables are grown