It's time to play...Add-A-Gram!

Anyone who loves Scrabble or this site is probably familiar with anagrams. But what about Add-A-Grams? An Add-A-Gram takes a word, adds a letter, and then shuffles the letters to make a new word (I guess you can call this an Add-A-Gram's Add-A-Grammar). In this game, I will define an Add-A-Gram chain, and a solution should contain the complete list of words in the chain.

For example, if I provided this definition: depend inside a race inside a counselor

The answer would be: rely -> relay -> lawyer

OK here is the definition for this Add-A-Gram chain:

a pentomino inside an element inside formerly inside a valley inside a compound inside an appendage inside choose inside a doctor inside most ephemeral inside injuries inside one without choices inside an inflammation inside chamber works

• "An Add-A-Gram takes a word, adds a letter, and then shuffles the letters to make a new word." I guess you can call that the Add-A-Grammar. Commented Jan 11, 2017 at 20:09
• I love the teamwork in this site! :D Commented Jan 11, 2017 at 20:11
• Well the final word has to be at least 12 letters... Commented Jan 11, 2017 at 20:19
• @wildBillMunson It's your post :) Commented Jan 11, 2017 at 20:38
• I've solved up to the appendage. Please tell me the words are not all this obscure.
– Will
Commented Jan 11, 2017 at 20:44

pentomino

N

element

N + e = Ne (Neon)

formerly

Ne + e = nee

a valley

nee + d = dene

a compound

dene + i = diene

an appendage

diene + t = endite

choose

endite + s = destine

a doctor

destine + r = resident

most ephemeral

resident + t = trendiest

injuries

trendiest + m = detriments

one without choices

detriments + i = determinist

inflammation

determinist + o = endometritis

chamber works

endometritis + v = divertimentos

• Wow I'm so impressed! You nailed it!!!! :) Commented Jan 11, 2017 at 20:58
• @wildBillMunson So instead of such obscure words at the beginning, why not something like N $\rightarrow$ EN $\rightarrow$ DEN $\rightarrow$ SEND $\rightarrow$ DENSE $\rightarrow$ TENSED $\rightarrow$ DESTINE? I generally find too many obscure words in a puzzle to be a strike against. Commented Jan 11, 2017 at 21:10
• @GentlePurpleRain I guess I was trying to make it a bit harder. As it was, with the obscure words, it was solved in under an hour. Next time, I'll try to avoid using too many of these. ;) Commented Jan 11, 2017 at 21:11
• @wildBillMunson I totally understand, but I would suggest that you try to make it harder by making the clues a little more obscure, rather than the solution. Also, a puzzle that's solved quickly (especially on Puzzling.SE) is not necessarily a bad puzzle (in fact, I would say if it takes too long to solve, it is, with very few exceptions, not a great puzzle). Commented Jan 11, 2017 at 21:14
• @GentlePurpleRain OK I like that plan! For the next one, I'll find an Add-A-Gram chain of words we actually use, and use clues like from a crossword puzzle. Thanks for the advice! :) Commented Jan 11, 2017 at 21:17