How to spell TILLIABLE correctly?

If you meant "tillable", a correct suggestion would be to use "arable" instead. The term "arable" refers to land that is suitable for cultivation or farming. This word accurately conveys the intended meaning, while "tilliable" is not a recognized term in English.

• billable The number of billable hours worked by the lawyer last month was significantly higher than the previous month.
• tillable

Intertubing

• antedating
• entertain
• entertainer
• entertaining
• inditing
• inner-tubing
• intertwine
• interurban
• intuiting
• undertaking