• countefoil,
• counterfoill,
• counter foil,
• quaterfoils,
• countre foils,
• xounterfoils,
• vounterfoils,
• founterfoils,
• dounterfoils,
• ciunterfoils,
• ckunterfoils,
• clunterfoils,
• cpunterfoils,
• counterfouls,
• conterfoils,
• counerfoils,
• countefoils,
• countrefoils,
• counterords,
• counterfoale

• countrified,
• counterblast,
• counterfeiter,
• counterclaim,
• counteroffer,
• connatural,
• countertenor,
• counterpunch,
• counterstain,
• counterblow,
• counterfoil,
• counterpart,
• counterglow,
• conterminous,
• counterfire,
• counter tube,
• counterpoised,
• countershot,
• counterwoman,
• counterbore,
• countermove,
• countermeasure,
• countermand,
• counterman,
• Contreras,
• counterplea,
• countersink bit,
• counterplay,
• counteraction,
• countermine,
• counterpoison,
• counterfeit,
• counterfactual,
• countersuit,
• countercheck,
• counterpose,
• counterplot,
• counterproposal,
• counterstrike,
• countermarch,
• counterperson,
• counter-drill,
• countertop,
• countryfied,
• counteract,
• counterpane,
• counterplan,
• countercoup,
• counterspy,
• counterpoint,
• countersink,
• countervail,
• countervailing,
• counterpoise,
• countersign.

The adjective form of the word "counterfoils" is "counterfoil".