Upstream :: Upstream (adv.) Toward the higher part of a stream; against the current.
Upstreet :: Upstreet (adv.) Toward the higher part of a street; as, to walk upstreet..
Upstroke :: Upstroke (n.) An upward stroke, especially the stroke, or line, made by a writing instrument when moving upward, or from the body of the writer, or a line corresponding to the part of a letter thus made..