Collocations for fundamental - adj.

be, seem
remain
consider sth, regard sth as
We consider these rights fundamental to democracy.

really, truly, very
I think they made a very fundamental mistake.

absolutely, quite (esp. BrE)
This principle is absolutely fundamental.

fairly (esp. BrE), rather (esp. AmE)

to
Improved funding is fundamental to the success of the project.

for
Low interest rates are fundamental for growth.

Fundamental is used with these nouns:
aim, alteration, aspect, assumption, belief, breach, cause, challenge, change, character, characteristic, component, concept, conflict, contradiction, conviction, criticism, defect, departure, difference, dilemma, disagreement, distinction, division, element, error, failure, feature, flaw, freedom, importance, inadequacy, incompatibility, ingredient, insight, issue, liberty, limitation, message, misconception, mistake, misunderstanding, nature, necessity, need, objection, paradox, part, physics, prerequisite, principle, problem, proposition, question, reappraisal, reform, reorganization, requirement, responsibility, rethink, review, revision, right, role, rule, shift, shortcoming, similarity, task, teaching, tension, thesis, transformation, truth, uncertainty, understanding, unit, unity, weakness