twin-size vs. full-size

twin-size

[twin-sahyz] / ˈtwɪnˌsaɪz /

Or twin-sized

adjective

(of a bed) approximately 39 inches (99 centimeters) wide and between 75 and 76 inches (191 and 193 centimeters) long; single.
pertaining to or made for a twin-size bed.

twin-size sheets.

full-size

[fool-sahyz] / ˈfʊlˌsaɪz /

Or full-sized

of the usual or normal size of its kind.

a full-size kitchen.
(of a bed) 54 inches (137 centimeters) wide and 75 or 76 inches (191 or 193 centimeters) long; double.
pertaining to or made for a full-size bed.

full-size sheets.