Firearm and Flintlock

Firearm noun - A portable weapon from which a shot is discharged by gunpowder.

Flintlock and firearm are semantically related. In some cases you can use "Flintlock" instead a noun "Firearm".

Flintlock noun - An obsolete gunlock that has flint embedded in the hammer; the flint makes a spark that ignites the charge.

Firearm and flintlock are semantically related. Sometimes you can use "Firearm" instead a noun "Flintlock".