Haredi vs religious sect

Haredi and religious sect both are nouns.

Word	Noun	Adjective	Verb	Adverb
Haredi	Yes	No	No	No
religious sect	Yes	No	No	No

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

Haredi: any of several sects of Orthodox Judaism that reject modern secular culture and many of whom do not recognize the spiritual authority of the modern state of Israel
religious sect: a subdivision of a larger religious group

Other hypernyms of Haredi include religious order, sect.

Haredi (noun)	religious sect (noun)
any of several sects of Orthodox Judaism that reject modern secular culture and many of whom do not recognize the spiritual authority of the modern state of Israel	a subdivision of a larger religious group