credence
A comparison of the two songs adds credence to claims of plagiarism.
His bruises added credence to his statement that he had been beaten.
His refusal to come clean continues to add credence to the suggestion that he is covering up criminal dealings.
Their sixth away win of the season adds further credence to their challenge for the title.

SMART Vocabulary: related words and phrases

Possible and probable
always
anything's possibleidiom
arguably
as never beforeidiom
auspiciously
bet
fair
houseroom
I shouldn't wonderidiom
in with a chance
it isn't over until the fat lady singsidiom
lean
manage
probabilistically
probability
probable
probably
prospective
tend
tip