belt vs belt out

belt is a noun but belt out is not a noun.

Word	Noun	Adjective	Verb	Adverb
belt	Yes	No	Yes	No
belt out	No	No	Yes	No

As verbs, belt and belt out are synonyms defined as:

belt (noun)	belt out (noun)
the act of hitting vigorously
a band to tie or buckle around the body (usually at the waist)
endless loop of flexible material between two rotating shafts or pulleys
ammunition (usually of small caliber) loaded in flexible linked strips for use in a machine gun
a vigorous blow
an elongated region where a specific condition or characteristic is found
a path or strip (as cut by one course of mowing)