plodder vs walker

plodder and walker both are nouns.

Word	Noun	Adjective	Verb	Adverb
plodder	Yes	No	No	No
walker	Yes	No	No	No

As nouns, walker is a hypernym of plodder; that is, walker is a word with a broader meaning than plodder:

Other hypernyms of plodder include footer, pedestrian.

plodder (noun)	walker (noun)
someone who moves slowly	an enclosing framework on casters or wheels; helps babies learn to walk
someone who works slowly and monotonously for long hours	a light enclosing framework (trade name Zimmer) with rubber castors or wheels and handles; helps invalids or the handicapped or the aged to walk
someone who walks in a laborious heavy-footed manner	a shoe designed for comfortable walking
	a person who travels by foot