ache
ail
Aide and arcade rhyme with brigade and starts with the letter A.
Jack and Jill are nursery rhyme characters that start with the letter J.
acow jumped over a moon
There are no words that start with 'u' and perfectly rhyme with 'performer'. However, depending on exactly what you want, you could take words that do rhyme, like informer or reformer, and add a word that starts with 'u' before them. An example of a line using that would be 'turn it up warmer'. Not a good line, unfortunately, but it's just an example.
"I" words that rhyme with "J" words can be difficult to find, but one example could be the word "icicle" rhyming with "pickle."
There are no words that start with sl that rhyme with match.
ham
Time
Some six letter words that rhyme with 'sigh' are:banzaiherebysupply
racquet. race.
The first four lines of the prologue rhyme the words "dignity", "scene", "mutiny" and "unclean".