No. Homonyms are words that sound the same, like pair and pear. Flat is a homograph; it's spelled the same but has different meanings.
The homonym homophone of "flat land" is "flatland." The homonym homophone of "joiner's tool" is "jointer's tool."
A homonym for "plain" is "plane," which can refer to a flat surface or a type of aircraft.
The homonym for plain is plane. "Plain" refers to a flat or simple surface, while "plane" can refer to a flat or level surface, an aircraft, or a tool for smoothing wood.
Plane - a flat surface or a type of aircraft.
Homonym for "flat land": "flatland" - words that are spelled and pronounced the same but have different meanings. Homophone for "a joiner's tool": "plane" - words that are pronounced the same but have different meanings and often different spellings.
land, plainblade, planeordinary, plainflying machine, planeetc.
"Drenched" does not have a homonym.
Hour is a homonym for our.
"Sweet" is a homonym for "suite."
Was is a linking verb. It does not have a homonym.
"Senses" is a homonym for "census."
Homonym for grays is graze