core

As a noun core is

crow.

As nouns the difference between focus and core

is that focus is (countable|optics) a point at which reflected or refracted rays of light converge while core is crow.

As a verb focus

is to cause (rays of light, etc) to converge at a single point.

As nouns the difference between compulsory and core

is that compulsory is something that is compulsory or required while core is crow.

As an adjective compulsory

is required; obligatory; mandatory.

As an adjective underlying

is lying underneath.

As a noun core is

crow.

As nouns the difference between core and drilling

is that core is crow while drilling is a triplet (one of three persons born to the same mother at the same time).

As nouns the difference between core and hinterland

is that core is crow while hinterland is hinterland.

As nouns the difference between core and minimum

is that core is crow while minimum is minimum.

As nouns the difference between core and periphery

is that core is crow while periphery is the outside boundary, parts or surface of something.

As nouns the difference between core and abs

is that core is crow while abs is .

As nouns the difference between holoenzyme and core

is that holoenzyme is (enzyme) a haloenzyme while core is crow.