Synonyms for Something:

n.

aught, somebody, someone, Anybody, Anyone, It, one another, each other. approximate, approximately, be, being, broadly, entity, existence, existent, imprecise, inaccurate, incorrect, individual, inexact, questionable, roughly, wrong. doodad, doohickey, so-and-so, whatchamacallit, widget, X, thingy, whatsername. stand out, make an impression, be an inspiration to someone, commend itself (to someone), exceed (someone's) expectations, knock your socks off, make a favorable impression (on someone), put someone/something in the shade, take your breath away. entity (noun)
article, being, existence, existent, individual, object, substance, thing.
event (noun)
being, portion, Anything.
life (noun)
existence.
substance (noun)
article, body, material, matter, object, stuff, substance, thing, unit.

Other synonyms:

aught, doodad, doohickey, somebody, someone, whatchamacallit, Anybody, Anyone, thingy, one another, each other, whatsername. so-and-so, Anything. entity, widget. existent, It. existence, X. being. Other relevant words:
approximate, approximately, article, aught, being, doodad, entity, existence, existent, individual, roughly, so-and-so, somebody, someone, widget, Anybody, Anyone, Anything, It, X, thingy, whatsername.

Usage examples for something

  1. He had to be doing something – Raiding with Morgan by Byron A. Dunn
  2. I have something to do. – The Young Musician or, Fighting His Way by Horatio Alger
  3. He must know something about it!" – Dialstone Lane, Part 2. by W.W. Jacobs