1. A playfellow.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• clamate,
• claimate,
• playdate,
• playmats,
• playmaker,
• ploymath,
• plamate,
• playmet,
• playmayte,
• palymate,
• playmete,
• plaonaste,
• clamydate,
• phyymata,
• plaagate,
• Playsance,
• plasmatur,
• plasmatuer,
• platymetre,
• playgam

• pliant,
• planate,
• Plumadore,
• plumate.

The adjective form of the word "playmate" is "playful".

The plural of the "playmate" can be the "playmates".

The singular of the "playmate" can be the "playmate".