No.
No, but "blast" and "classed" do rhyme.
Yes. See the related question below for "What rhymes with last?"
A hink pink is a word puzzle where the answer is a pair of rhyming words that match a given clue. "Final explosion" could be a hink pink for "last blast." In this case, "final" and "blast" rhyme and also fit the clue of an explosive event.
Grasp is a verb and a noun. Verb: Grasp my hand before you fall. Noun: His hand slipped from my grasp.
Some words that rhyme classmen are ass men, past ten, has been, and crass friend. You could probably also use past trend, last yen, or blast them.
Serpens is in the grasp of Ophiuchus.
A synonym for "grasp" is "understand" or "comprehend."
Internal rhyme.
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ner rhyme, but not rhyme ner rhyme, but not rhyme ner rhyme, but not rhyme
No, 'ox' and 'not' do not rhyme.
A nettle Plant