Words ending
in -tial.

circumstance → circumstantial

Based on details that suggest something, but do not prove it.

“The evidence was only circumstantial.”

confident → confidential

Meant to be kept secret.

“The letter was confidential.”

No common root word

A qualification or document that proves who you are.

“The guard checked her credentials.”

essence → essential

Absolutely necessary.

“Water is essential for life.”

influence → influential

Having a strong effect on people or things.

“She was an influential scientist.”

No common root word

First, or the first letter of a name.

“The initial plan changed.”

No common root word

To do with fighting or war.

“Karate is a martial art.”

palace → palatial

Like a palace, very grand.

“They stayed in a palatial hotel.”

part → partial

Only part, not whole.

“There was a partial view of the sea.”

No common root word

Possible in the future.

“The idea has great potential.”

preference → preferential

Giving an advantage to one person or group.

“Members get preferential seats.”

president → presidential

To do with a president.

“The presidential election is next year.”

resident → residential

With houses rather than shops or offices.

“We live in a residential street.”

sequence → sequential

Following in order.

“The steps are sequential.”

space → spatial

To do with space or position.

“Puzzles help develop spatial skills.”

substance → substantial

Large in amount or importance.

“He ate a substantial breakfast.”

torrent → torrential

Falling very heavily, like a torrent.

“Torrential rain flooded the road.”