manna vs manna from heaven

manna and manna from heaven both are nouns.

Word	Noun	Adjective	Verb	Adverb
manna	Yes	No	No	No
manna from heaven	Yes	No	No	No

As nouns, manna and manna from heaven are synonyms defined as:

manna and manna from heaven: (Old Testament) food that God gave the Israelites during the Exodus

Other synonyms of manna include miraculous food.

manna (noun)	manna from heaven (noun)
(Old Testament) food that God gave the Israelites during the Exodus	a sudden happening that brings good fortune (as a sudden opportunity to make money)
hardened sugary exudation of various trees	(Old Testament) food that God gave the Israelites during the Exodus