wheeler dealer vs self-seeker

wheeler dealer and self-seeker both are nouns.

Word	Noun	Adjective	Verb	Adverb
wheeler dealer	Yes	No	No	No
self-seeker	Yes	No	No	No

As nouns, self-seeker is a hypernym of wheeler dealer; that is, self-seeker is a word with a broader meaning than wheeler dealer:

wheeler dealer: a shrewd or unscrupulous person who knows how to circumvent difficulties
self-seeker: a person who places expediency above principle

Other hypernyms of wheeler dealer include opportunist.

wheeler dealer (noun)	self-seeker (noun)
a shrewd or unscrupulous person who knows how to circumvent difficulties	a person who places expediency above principle