Enter criteria and click Find Words
301 five letter words start with I, and a third of them open with IN.
N takes about thirty three percent of the second box, then M at eleven, D at ten and R at nine.
ITEMS, INDEX, IMAGE, ISSUE and IDEAS are the most common entries, and they spread across four different branches.
A good share of the rest of the list is place names and nationalities, which inflates the count without adding options.
INDEX, INPUT, INNER and INTRO share only those two opening letters and nothing else, so landing IN tells you less than a two letter match usually would.
ITEMS or IDEAS. Both test four common letters and neither commits you to the crowded IN branch.
If one of them lands a partial hit, the S ending they share is the piece most likely to carry over.
IN works as a prefix on a very large set of roots, and at five letters that produces dozens of entries with nothing else in common.
A noticeable share are, since country and language names cluster here. Treat the count as generous rather than as a list of real options.
IMAGE. Its M and G test letters that ISSUE does not reach, and ISSUE repeats its S, which costs a box.