A-B C-F G-K L-O P-R S-V W-Z
Gatepier
  Stone gate post usually placed either side of a drive 
Gazebo
  A turret or balcony providing a view or a small building overlooking a view
Gig mill
  A teazle raising machine for raising the nap on a woollen cloth
Gneiss
  Generally a coarse grained banded crystalline metamorphic rock which has been subject to high temperatures and pressures.
Gothic
  A pointed arch style of architecture both medieval and Victorian
Gothick
  the use of pointed-arch forms in Georgian times used for decorative and mood effects
Grist
  Corn for grinding
Hammerbeam
  Projection from wall at foot of principal rafter
Hipped roof
  A roof with ends as well as sides inclined
Indigenous (or First) Peoples
 

The people who first lived in North America.  Europeans called them 'Indians' at first because they had darker skin and because the Europeans thought that they had reached India.

Industrialising
  Developing industry on an extensive scale.
Ionic
  An order of proportions of columns and entablature of Greek origin
Italianate
  Having an Italian style or appearance
Jacobethan (Jacobean)
  A style of architecture developed during James I reign
Kerseymeres
  A twilled fine woollen cloth simulating cashmere