Does heart rhyme with park

Answer 1

No. The ending is not the same. There is something known as "wrenched rhyming." Meaning you purposely mispronounce a word to make it rhyme with another. There is another type, I don't know what it's called, that refers to two word that don't quite rhyme, but are inserted into the poem as if they did. "Heart, park" falls into the latter category. The term for endings that have similar vowels but different consonants is assonant rhyme, the converse being consonant rhyme.