4-Letter Words Matching T_O_

There are 13 4-letter words that match T_O_. 9 are common words, such as THOU and TOOK. A rarer one is TROP. 5 words contain a doubled letter.

Full list 13

thoutooktooltoottrodtrottrowtroytwostaostoomtoontrop

About this list

Words
13 (9 common words)
Common example
thou
Rare example
trop
Doubled letters
5
Ending in S
2

Questions

How many 4-letter words matching t_o_ are there?

13. 9 of them are common words.

What is a common example?

THOU is among the common words in this set.