How to spell ʃ
Common words:
oCEan
groCery *
CHef
caCHE
suspiCIon
Sugar
nauSEous
faSCist
conSCIence
SHine
aSSure
seSSIon
naTIon
From other languages:
FuCHSia
GauTHier **
SCHnapps
* Regional dialect
** Pronunciation varies
Footnote 1: Linguists have identified about 400 distinct sounds used by the known languages. Another linguistics concept is the "morpheme": think of it as a unit of meaning. For example combine the base "dog" (which refers to an animal) with "s" (which means "more than one), and you get "dogs". Some linguists refer to the spelling unit as a "grapheme": a letter or combination of letters that spells a single phoneme, or some conventional combination of phonemes.
Footnote 2: Phonemes and sounds are not the same. The essence of a phoneme is that it signals a difference in meaning. Thus in "sing" and "sang", the sounds spelled by "a" and "i" are phonemes because the two words have different meanings. On the other hand, the sounds spelled by "ng" in "singer" and "finger" are different in most English dialects, but the difference is ignored. If they were phonemes, then "singer" rhymed with "finger" would be a different word than its usual pronunciation. (And in "ginger", "ng" spells a combination of three phonemes.)
Footnote 3: Homonyms come in two varieties: two words with the same spelling but different sounds (and meanings), called homographs. And two (or more) words with the same sound but different spellings (and meanings), called homophones. The study of homonyms helps one to understand the difference between a sound and a phoneme.
Footnote 4: Almost every phoneme in English is spelled two or more ways. Every letter and most letter combinations stand for two or more phonemes.