• bakcup,
• backep,
• vackcap,
• nackcap,
• hackcap,
• gackcap,
• bzckcap,
• bsckcap,
• bwckcap,
• bqckcap,
• baxkcap,
• bavkcap,
• bafkcap,
• badkcap,
• bakcap,
• backkcap,
• backcaap,
• backcapp,
• backkap,
• backcapa

The adjective form of the word "backcap" is "backcapped".

The plural form of the word "backcap" is "backcaps"

The singular form of the word "backcap" is "backcap". The word "backcap" is already in its singular form, and it does not change when referring to a single instance or object.