noun, noun which may take the genitive case particle 'no'
three times; triple; threefold
Used as a noun or with の to modify another noun. Indicates a quantity, amount, or degree that is three times as much as a reference.
今年の売り上げは去年の三倍になった。
This year's sales were three times last year's.
この部屋はあの部屋の三倍の広さだ。
This room is three times as large as that one.
Means 'double' or 'two times'. 三倍 is specifically 'three times'.
General counter/suffix for 'times' or 'fold'. 三倍 is a specific multiple.
Compound of 三 (three) and 倍 (times, -fold).