scam vs diddle

scam is a noun but diddle is not a noun.

Word	Noun	Adjective	Verb	Adverb
scam	Yes	No	Yes	No
diddle	No	No	Yes	No

As verbs, scam and diddle are synonyms defined as:

Other synonyms of scam include bunco, con, defraud, goldbrick, hornswoggle, mulct, nobble, rook, short-change, swindle, victimize.

scam (noun)	diddle (noun)
a fraudulent business scheme

scam (verb)	diddle (verb)
deprive of by deceit	manipulate manually or in one's mind or imagination
	deprive of by deceit