• boton,
• bolton,
• boltin,
• boulton,
• bollton,
• boolton,
• boltn,
• volt-on,
• golt-on,
• bklt-on,
• bllt-on,
• bplt-on,
• b0lt-on,
• b9lt-on,
• bokt-on,
• bopt-on,
• bolr-on,
• bolf-on,
• bolg-on,
• boly-on

The adjective form of the word "bolt-on" is "bolted-on".

The plural form of "bolt-on" is "bolt-ons".

The singular form of the word "bolt-on" is "bolt-on". This word is typically used as a compound noun and does not have a distinct singular form.