The difference between Amass and Mound

When used as nouns, amass means a mass, whereas mound means an artificial hill or elevation of earth.

When used as verbs, amass means to collect into a mass or heap, whereas mound means to fortify with a mound.

check bellow for the other definitions of Amass and Mound

Amass as a verb (transitive):

To collect into a mass or heap
Amass as a verb (transitive):

to gather a great quantity of; to accumulate.

Examples:

"to amass a treasure or a fortune"

"to amass words or phrases"

Amass as a noun (obsolete):

A mass; a heap.

Examples:

"rfquotek Sir H. Wotton"

Mound as a noun:

An artificial hill or elevation of earth; a raised bank; an embankment thrown up for defense

Examples:

"synonyms: bulwark rampart"
Mound as a noun:

A natural elevation appearing as if thrown up artificially; a regular and isolated hill, hillock, or knoll.
Mound as a noun (baseball):

Elevated area of dirt upon which the pitcher stands to pitch.
Mound as a noun:

A ball or globe forming part of the regalia of an emperor or other sovereign. It is encircled with bands, enriched with precious stones, and surmounted with a cross.
Mound as a noun (US, vulgar, slang):

The mons veneris.
Mound as a noun (obsolete, anatomy, measurement, figuratively):

A hand.
Mound as a noun (obsolete):

A protection; restraint; curb.
Mound as a noun (obsolete):

A helmet.
Mound as a noun (obsolete):

Might; size.

Mound as a verb (transitive):

To fortify with a mound; add a barrier, rampart, etc. to.
Mound as a verb (transitive):

To force or pile into a mound or mounds.

Examples:

"He mounded up his mashed potatoes so they left more space on the plate for the meat."