S1O1U1N1D2P3R1O1O1F4S1
17 points
SOUNDPROOFS is validvalid
SOUNDPROOF, [v SOUNDPROOFED, SOUNDPROOFING, SOUNDPROOFS] : SOUNDPROOFING [v]
SOUNDPROOF, to insulate so as to obstruct the passage of sound [v]
SOUNDPROOF, [v SOUNDPROOFED, SOUNDPROOFING, SOUNDPROOFS] : SOUNDPROOFING [v]
SOUNDPROOF, to insulate so as to obstruct the passage of sound [v]