GROUNDSEL is a 9 letter word that starts with G.

1. \Ground"sel\, n. [OE. grundswilie, AS. grundeswylige,
   grundeswelge, earlier gundiswilge; gund matter, pus + swelgan
   to swallow. So named as being good for a running from the
   eye. See {Swallow}, v.] (Bot.)
   An annual composite plant ({Senecio vulgaris}), one of the
   most common and widely distributed weeds on the globe.
   
   

2. \Ground"sel\, Groundsill \Ground"sill`\, n. [Ground +
   sill.]
   See {Ground plate}
   (a), under {Ground}