• groupwork,
• groudwork,
• groundworks,
• groundworker,
• crownmwork,
• froundwork,
• vroundwork,
• broundwork,
• hroundwork,
• groundwirk,
• groundwsork,
• groundweork,
• goundwork,
• grundwork,
• grondwork,
• grounwork,
• groundwok,
• groundworrk,
• Truncwork,
• goundward

• ground cover,
• ground floor,
• groundfish,
• groundling,
• ground cedar,
• ground loop,
• grandmother,
• groundsel,
• greyhound,
• ground sloth,
• groundless,
• ground zero,
• ground tackle,
• groundkeeper,
• ground out,
• grandson,
• ground stroke,
• ground pink,
• groundspeed,
• Grand Turk,
• groundskeeper,
• grandeur,
• groundcover,
• ground ivy,
• grinder,
• ground water,
• groundbreaker,
• ground crew,
• ground snake,
• ground fire,
• groundmass,
• ground cloth,
• groundberry,
• ground forces,
• grandiose,
• grounding,
• groundhog,
• groundnut,
• grounder,
• grounds,
• grand fir,
• groundball,
• ground-shaker,
• groundsman,
• ground-berry,
• ground-floor,
• grind out,
• ground fir.

The adjective form of the word "groundwork" is "groundwork". It does not change in form when used as an adjective. Example: "They laid the groundwork for the project".

The plural form of "groundwork" is "groundworks".

The singular form of the word "groundwork" remains the same, as it is a noun referring to the foundation or preliminary work for something.