The difference between Grinder and Submarine

Grinder as a noun:

One who grinds something, such as the teeth.

Grinder as a noun (anatomical):

A molar.

Grinder as a noun:

A power tool with a spinning abrasive disc, used for grinding, smoothing, and shaping materials, usually metal.

Grinder as a noun (US, regional):

A sandwich made on a long, cylindrical roll.

Grinder as a noun:

A kitchen gadget for processing coffee, herbs etc. into small or powdered pieces

Grinder as a noun:

The restless flycatcher () of Australia, which makes a noise like a scissors grinder.

Grinder as a noun (music, slang):

A fan or performer of grindcore music.

Grinder as a noun (slang, dated):

A student who studies hard; a swot.

Grinder as a noun (slang, dated):

A person who coaches students for an upcoming examination.

Grinder as a noun (ice hockey slang):

A hard-working, physical player with limited offensive ability.

Submarine as an adjective:

Undersea.

Submarine as an adjective:

Hidden or undisclosed.

Submarine as an adjective (baseball):

Of a pitch, thrown with the hand lower than the elbow.

Submarine as a noun:

A boat that can go underwater.

Submarine as a noun:

A kind of sandwich made in a long loaf of bread.

Submarine as a noun (baseball):

Pitch delivered with an underhand motion.

Submarine as a noun:

Any submarine plant or animal.

Submarine as a noun (informal):

A stowaway on a seagoing vessel.

Submarine as a verb (intransitive):

To operate or serve on a submarine.

Submarine as a verb (transitive):

To torpedo; to destroy with a sudden sneak attack.

Submarine as a verb (intransitive, sometimes, figurative):

To sink or submerge oneself.