How to Say "endeavor" in Spanish
The Spanish word for “endeavor” is “esfuerzo” — A2 level. This is a very common word in everyday Spanish.

Examples
Hicimos un gran esfuerzo para terminar el proyecto a tiempo.
We made a great effort to finish the project on time.
Con mucho esfuerzo, logró levantar la caja pesada.
With a lot of exertion, he managed to lift the heavy box.
Su esfuerzo constante en los estudios dio frutos.
Her constant endeavor in her studies paid off.
The 'hacer' connection
In Spanish, we usually 'make' effort, using the verb 'hacer' (to do/make). So, 'I made an effort' is 'Hice un esfuerzo.' This is the most common way to use it.
Confusing Noun and Verb
Mistake: “Yo esfuerzo mucho.”
Correction: Yo hago mucho esfuerzo (I make a lot of effort) or Yo me esfuerzo mucho (I exert myself a lot). Remember 'esfuerzo' is the noun (the thing), not the action itself.
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