# What is my word?

I have a word. In the middle of my word are the letters 'ergro'. There are three letters at the start and the end of my word. The three letters at the start of my word are the same as the three letters at the end.

What is my word?

I think its

Underground.

So far this is the only English word I could find that worked with this.

• Overground.............................. Wombling free? – Jazcash Aug 11 '15 at 8:39

Litscape claims there is another:

supergroups

It appears to be a music thing.

• This works, but the letters are not in the same order. – user9377 Aug 10 '15 at 12:28
• @Kslkgh: Well, technically, you only said the letters were the same, you didn't state they had to be in the same order. – user15498 Aug 10 '15 at 12:39
• @paxdiablo Yeah, sorry. – user9377 Aug 10 '15 at 12:40
• I actually liked it more because the letters weren't in the same order. – Engineer Toast Aug 10 '15 at 13:09
• @Warlord099 I think "underground" should have more votes because it was first by several hours but not just because its letters are in the same order. I think that makes it a more interesting word but not a better fit to the puzzle. – Engineer Toast Aug 10 '15 at 17:00

Words of 11 letters with matching triplets start and end:

antioxidant
entitlement
microcosmic
redelivered
tessellates
underground <-- voila


And if the order of the triplet letters is malleable:

hypertrophy
stealthiest
researchers
restrainers
earthenware
encumbrance
sacroiliacs
sanitarians
shellfishes
inoculation
trendsetter


But annoyingly none that I can see which end in the opposite order to the start.

Of the above, we can see that some have 4 matching letters:

redelivered
sanitarians


And there is in fact a 9-letter which packs 2 4-letter repeats:

outshouts


The patterns for those who are grep -P ready:

^(...).{5}\1$// 11 letters, common start and end triplet ^(....).+\1$        // 4-letter repeats

// unordered matching end triple
^(.)(.)(.).{5}(\1(\2\3|\3\2)|\2(\1\3|\3\1)|\3(\1\2|\2\1))\$

• Im guessing you wrote some script for this? If so could you provide it in your answer? – Trevi Awater Aug 11 '15 at 13:44
• @Aʟᴀɢᴀʀᴏs: updated answer accordingly. No script per se, just patters to use with grep and a word list. – Phil H Aug 12 '15 at 7:09