tomorrow

The English language has an abundance of little-used words which relate to the days that come before or after the present one. We have words for “the quality of being tomorrow” (tomorrowness) and for “of or relating to yesterday” (yester, yestreen, and pridian). There is also tomorrower, meaning "a procrastinator," and of course mañana ("an indefinite time in the future").

Tomorrow functions as a noun and as an adverb; you should avoid employing it as an adjective or verb.