e·co·sys·tem 
(ēkō-sĭs′təm, ĕkō-)
(ēkō-sĭs′təm, ĕkō-)n.
An ecological community together with its environment, functioning as a unit.
- nonreturnable
- nonrigid
- nonscheduled
- nonsectarian
- nonsectarianism
- nonsedating
- nonself
- nonsense
- nonsense verse
- nonsensical
- nonsensicality
- nonsensically
- nonsensicalness
- non sequitur
- nonsexist
- nonsignificance
- nonsignificant
- nonsignificantly
- nonsked
- nonskid
- nonslip
- non-small cell lung cancer
- nonsmoker
- nonsmoking
- nonspecific