similar

Concise Oxford English Dictionary © 2008 Oxford University Press:
similar/ˈsɪmələ(r)/

▶adjective

• 1 of the same kind in appearance, character, or quantity, without being identical.

• 2 Geometry (of geometrical figures) having the same angles and proportions, though of different sizes.

▶noun

• 1 chiefly archaic a person or thing similar to another.

• 2 a substance that produces effects resembling the symptoms of a disease (the basis of homeopathic treatment).

– derivatives
similarity noun (pl. similarities),
similarly adverb.

– origin C16: from Fr. similaire or med. L. similaris, from L. similis ‘like’.

usage: The standard construction for similar is with to, as in I've had problems similar to yours. The construction similar as (I've had similar problems as yourself) is not accepted as correct in standard English.