terrorist group vs PSF

terrorist group and PSF both are nouns.

Word	Noun	Adjective	Verb	Adverb
terrorist group	Yes	No	No	No
PSF	Yes	No	No	No

terrorist group (noun)	PSF (noun)
a political movement that uses terror as a weapon to achieve its goals	a terrorist group of radical Palestinians who split with al-Fatah in 1967 but now have close relations with al-Fatah; staged terrorist attacks against Israel across the Lebanese border