Restrict is defined as to keep someone or something within certain limits.
Expand is defined as to increase in size, unfold or spread out.
To allow (something) to develop or increase by a natural process:
To cause to become greater in size, amount, degree, etc.; add to; augment
To make (a quantity) smaller.
To the full extent; completely.
To diversify is defined as to divide up and add variety.
To give a particular character or function to:
To decrease or limit the scope, extent, or number of
Find another word for broaden. In this page you can discover 16 synonyms, antonyms, idiomatic expressions, and related words for broaden, like: restrict, expand, widen, grow, increase, decrease, extend, wide, diversify, branch-out and specialise.