crystals
join, meet
Amass-meaning to gather together.
Bunches is a word for heaps. It means a number of things growing or fastened together.
confer
Cluster is a 7 letter word that means gather together. Other words include collect, combine and compile.
The six-letter word you're looking for is "confer." The last letter of "confer" is "r."
answer is fasten
"FOREGATHERED"
The word you're after is sweepstake
The word "conjoins" - meaning "connects two things together".
The word fastened has two syllables.
the mouthpiece of a bridle, having fittings at each end to which the reins are fastened.