German words for....

Does anybody know what the German words for 'sibilation' and 'morphosyntax' are? I can't find them in any dictionaries I have used up to now and google language tools can't translate them either. I know the German word for sibilant is 'Zischlaut' but I cannot find sibilation.

Thanks.

Morphe in greek means Bild ,Icon...

Syntax structure Satzbau,Satzstellung...

there is "die Um/lautung", why not Zischlautung?

Other words for Morphe.. Gestalt , form