vegetable patch vs vegetable garden

vegetable patch and vegetable garden both are nouns.

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

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

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

Other synonyms of vegetable patch include kitchen garden.

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