political hack vs machine politician

political hack and machine politician both are nouns.

Word	Noun	Adjective	Verb	Adverb
political hack	Yes	No	No	No
machine politician	Yes	No	No	No

As nouns, political hack and machine politician are synonyms defined as:

political hack and machine politician: a politician who belongs to a small clique that controls a political party for private rather than public ends

Other synonyms of political hack include hack, ward-heeler.

political hack (noun)	machine politician (noun)
a politician who belongs to a small clique that controls a political party for private rather than public ends	a politician who belongs to a small clique that controls a political party for private rather than public ends