menstruating

As verbs the difference between menstruating and period

is that menstruating is while period is (obsolete|intransitive) to come to a period; to conclude.

As an adjective period is

appropriate for a given historical era.

As an interjection period is

(chiefly|north america) and nothing else; and nothing less; used for emphasis.

As a noun period is

(obsolete|medicine) the length of time for a disease to run its course.

As a noun terms

is .

As a verb menstruating is

.