name of compound two word

[weal5300]

what's name of this role
when compound two word
like
gaku+kou=gakkou
ichi+shoni=isshoni
I know rendaku but what's name of role when compound two word

 

[Toritoribe]

広義の促音便

"Shoni" doesn't make sense. It's not a word. "Issho ni" is "issho" + the particle "ni".

By the way, why do you make a new thread for the same topic as the one you already made?

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