hassock

noun3

1. •
   A cushion used primarily in churches for kneeling on while praying.

   • At the next service he found a flower on his hassock and a highly suggestive Catholic bookmarker tucked into his hymn-book. — 1978
2. •
   A thick cushion used as a seat; an ottoman or pouffe.
3. •
   A dense clump of grass or vegetation; a tussock.