ahead

As a noun taxonomy

is the science or the technique used to make a classification.

As an adverb ahead is

in or to the front; in advance; onward.

As adverbs the difference between ahead and afield

is that ahead is in or to the front; in advance; onward while afield is away (from the home or starting point, physical or conceptual); usually preceded by far (or farther, further).

As a noun form

is shape.

As an adverb ahead is

in or to the front; in advance; onward.

As adverbs the difference between aloft and ahead

is that aloft is in the air; in the sky while ahead is in or to the front; in advance; onward.

As an adverb ahead

is in or to the front; in advance; onward.

As a verb heading is

present participle of lang=en.

As a noun heading is

the title or topic of a document, article, chapter, or of a section thereof.

As an adverb ahead

is in or to the front; in advance; onward.

As a noun forespurrer is

(obsolete|nonce) one who rides ahead; a harbinger.