excels

As a noun terms

is .

As a verb excels is

(excel).

As verbs the difference between excels and specializes

is that excels is (excel) while specializes is (specialize).

As a verb excels

is (excel).

As an adjective proficient is

good at; skilled; fluent; practiced, especially in relation to a task or skill.

As a noun proficient is

an expert.

As a noun excess

is the state of surpassing or going beyond limits; the being of a measure beyond sufficiency, necessity, or duty; that which exceeds what is usual or proper; immoderateness; superfluity; superabundance; extravagance; as, an excess of provisions or of light.

As an adjective excess

is more than is normal, necessary or specified.

As a verb excels is

third-person singular of excel.

As verbs the difference between excels and expels

is that excels is third-person singular of excel while expels is third-person singular of expel.