SWIFTj with a soft j
flyer
closit
There is no word that rhymes with slither and means fast. The closest word is hither, which means come here. The rest are not related to movement directly at all.
Well I am from France and the French word that rhymes with loin is Gyhoin it means the rain. American words are coin, growin (if you say it fast), and sewing (say it fast too)
The word that means and rhymes with cloak is "joke."
The word "afraid" slant rhymes with the word "away" but means scared.
The word that means kneel and rhymes with melt is "knelt."
The word that rhymes with day and means sky is "gray."
The word that rhymes with angel and means free is "mangel."
The word that rhymes with "creed" and means the opposite of follow is "lead".
One word that rhymes with 'it' and means resist is 'pit'. In this instance the word 'pit' means to set in direct opposition.
The word "lean" fits your criteria as it means cool and rhymes with green.