Would tonight/night be an exact rhyme or a slant rhyme? And is begin/him a slant rhyme?

Question

Thanks
-MC

Answer 1

Also, is by/fly slant?

Thanks
-MC

Answer 2

http://web.cn.edu/kwheeler/lit_terms_S.html#slant_rhyme_anchor

Two of the examples you gave are actual rhymes. One seems more of a slant rhyme. Be sure to read the definition of slant rhyme in the linked webpage.