• backage,
• backack,
• backthe,
• acache,
• backarre,
• backachea,
• backachee,
• backifhe,
• vackache,
• hackache,
• gackache,
• bacckache,
• backkache,
• Snakache,
• Taccace,
• Packach,
• baccatie,
• Balkishe,
• Backeache,
• Backake

• bacchic,
• bazooka,
• backwash,
• backes,
• baksheesh,
• backsheesh,
• backhaus.

The adjective form of the word "backache" is "backaching".

The plural of the "backache" can be the "backaches".

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