• ch,
• rs,
• css,
• bcs,
• pcs,
• hcs,
• cn,
• cus,
• ts,
• cks,
• gcse,
• cts,
• csh,
• acs,
• ck,
• xs,
• ls,
• cvs,
• fs,
• ccas

• Y's,
• vs.,
• CSE,
• S,
• ca,
• co.,
• co,
• as,
• b.s.,
• q's,
• sc,
• b's,
• s's,
• x's,
• s.c.,
• -'s,
• a's,
• ks,
• j's,
• c's,
• cd,
• k's,
• cu.,
• C,
• w's,
• -s,
• g's,
• v's,
• co-.

The adjective form of "cs" is "cubic".

The plural form of the word "cs" is "cs's".

The singular form of the word "cs" is "c"