headstock

As a noun headstock

is a headframe.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between penstock and headstock

is that penstock is a sluice or pipe which allows the controlled flow of water from behind a dam, typically routing it to a turbine of a power plant while headstock is {{cx|mining|lang=en}} A headframe.

As a noun headstock is

a headframe.

As nouns the difference between deadstock and headstock

is that deadstock is merchandise that had been removed from sale, now offered for sale at a later date while headstock is a headframe.

As nouns the difference between headstock and tailstock

is that headstock is {{cx|mining|lang=en}} A headframe while tailstock is the part of a lathe that holds the object being worked along its rotatory axis.

As nouns the difference between string and headstock

is that string is thong (as undergarment or swimwear) while headstock is a headframe.

As nouns the difference between guitar and headstock

is that guitar is a stringed musical instrument, usually with fretted fingerboard and 6 strings, played with the fingers or a plectrum (guitar pick) while headstock is a headframe.

As a verb guitar

is (rare) to play the guitar.

As an acronym cow

is (computing).

As a noun headstock is

a headframe.

As nouns the difference between clamp and headstock

is that clamp is a brace, band, or clasp for strengthening or holding things together while headstock is {{cx|mining|lang=en}} A headframe.

As a verb clamp

is to fasten in place or together with (or as if with) a clamp.