How to sign: a stage area out of sight of the audience
Similiar / Same: offstage, backstage
Categories: stage
How to sign: a movable organ for flying (one of a pair)
Categories: organ
Within this category: ala, forewing, halter, pennon, wing case
How to sign: an addition that extends a main building
Similiar / Same: annex, annexe, extension
Categories: add-on, addition, improver
Within this category: ell