"estimulate" is not a word.

Dictionary definition of "stimulate" To rouse to activity or heightened action, as by spurring or goading; excite, provoke 2. To increase temporarily the activity of (a body organ or part). 3. To excite or invigorate (a person, for example) with a stimulant/drug. There is no such word as "estimulate" Perhaps you mean "estimate? ". If so, that word means to guess,