walker vs stalker

walker and stalker both are nouns.

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

As nouns, stalker is a hyponym of walker; that is, stalker is a word with a more specific, narrower meaning than walker:

walker (noun)	stalker (noun)
an enclosing framework on casters or wheels; helps babies learn to walk	someone who stalks game
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 with long stiff strides
a shoe designed for comfortable walking	someone who prowls or sneaks about; usually with unlawful intentions
a person who travels by foot