opponent /ə-pōˈnənt/

1. The person opposed to one in a contest, struggle, battle, etc
2. Someone who opposes a course of action, belief, etc
3. An opponent muscle (anatomy)

1. Opposing
2. Antagonistic (with to; formerly with with)
3. Placed opposite or in front
4. (of a muscle) opposing one part (eg a digit) to another (anatomy)

• play fast and loose
• playfellow
• playfellows
• play fine
• play first fiddle
• play footsie
• play footsie with
• play for love
• play for safety
• play for time
• playful
• play full
• playfully
• playfulness
• playfulnesses
• play games with
• playgirl
• playgirls
• play-goer
• play-goers
• play-going
• playground
• playgrounds
• playgroup
• playgroups