shibboleth of schedule

From wiki:

"The Dutch used the name of the port townScheveningen as a shibboleth to tell Germans from the Dutch ("Sch" in Dutch is analyzed as the letter "s" and the digraph "ch", producing the consonant cluster sx, while in German it is analyzed as the trigraph "sch," pronounced[ʃ]).^[8][9]"

^{cf: schedule}

sch: /sk/ or /ʃ/ (sh)

Many Germanic words in English with sch are pronounced as /ʃ/

schadenfreude

schneider

schmidt

schilling

schmuck

schmooze

/sk/

schema

schism

schizophrenia

scholar