plain stitch vs knit stitch

plain stitch and knit stitch both are nouns.

Word	Noun	Adjective	Verb	Adverb
plain stitch	Yes	No	No	No
knit stitch	Yes	No	No	No

As nouns, plain stitch and knit stitch are synonyms defined as:

plain stitch and knit stitch: a basic knitting stitch made by putting the needle through the front of the stitch from the lefthand side

Other synonyms of plain stitch include knit, plain.

plain stitch (noun)	knit stitch (noun)
a basic knitting stitch made by putting the needle through the front of the stitch from the lefthand side	a basic knitting stitch made by putting the needle through the front of the stitch from the lefthand side