left wing vs sect

left wing and sect both are nouns.

Word	Noun	Adjective	Verb	Adverb
left wing	Yes	No	No	No
sect	Yes	No	No	No

As nouns, sect is a hypernym of left wing; that is, sect is a word with a broader meaning than left wing:

left wing: those who support varying degrees of social or political or economic change designed to promote the public welfare
sect: a dissenting clique

Other hypernyms of left wing include faction.

left wing (noun)	sect (noun)
those who support varying degrees of social or political or economic change designed to promote the public welfare	a dissenting clique
	a subdivision of a larger religious group