When we talk about "crowds out," we are referring to a situation in which something dominates or occupies an area to such an extent that there is little room left for anything else. Some synonyms that can replace this phrase include "overwhelms," "dominates," "overshadows," "takes over," "drowns out," "displaces," "precludes," "supplants," "edges out," "suffocates," "substitutes," "usurps," "occupies," and "eclipses." These words all carry the notion of one thing overpowering another, whether it be in terms of physical space, attention, or influence. Using these synonyms can add variety to your speech/writing, making your communication clearer and more effective.