bulge out vs bulge

bulge out is not a noun while bulge is a noun.

Word	Noun	Adjective	Verb	Adverb
bulge out	No	No	Yes	No
bulge	Yes	No	Yes	No

As verbs, bulge out and bulge are synonyms defined as:

Other synonyms of bulge out include bug out, come out, pop, pop out, protrude, start.

bulge out (noun)	bulge (noun)
	something that bulges out or is protuberant or projects from its surroundings

bulge out (verb)	bulge (verb)
bulge outward	swell or protrude outwards
	cause to bulge or swell outwards
	bulge outward
	bulge out; form a bulge outward, or be so full as to appear to bulge