struggle
/ˈstrə-gəl/
verb
to make strenuous or violent efforts in the face of difficulties or opposition
to proceed with difficulty or with great effort
struggling with the problem
noun
contest, strife
a violent effort or exertion : an act of strongly motivated striving
tussle
armed struggle
noun phrase
the automatic competition of members of a natural population for limited vital resources (such as food, space, or light) that results in natural selection