stodgy vs stick-in-the-mud

stodgy is not a noun while stick-in-the-mud is a noun.

Word	Noun	Adjective	Verb	Adverb
stodgy	No	Yes	No	No
stick-in-the-mud	Yes	Yes	No	No

As adjectives, stodgy and stick-in-the-mud are synonyms defined as:

stodgy and stick-in-the-mud: (used pejoratively) out of fashion; old fashioned

Other synonyms of stodgy include fogyish, moss-grown, mossy.

stodgy (noun)	stick-in-the-mud (noun)
	someone who moves slowly

stodgy (adjective)	stick-in-the-mud (adjective)
excessively conventional and unimaginative and hence dull	(used pejoratively) out of fashion; old fashioned
heavy and starchy and hard to digest
(used pejoratively) out of fashion; old fashioned