The three words in the title are all odd. They have unique characteristics. Try to guess what they are. I’ll give you some hints and in a few days I’ll post the answers.

Hint 1: Each is the longest English word with a particular trait.

Hint 2:  the latter two words’ traits are each unique at that length, i.e. no other English words of that length has those traits.

Hint 3: Friends has two other words of the same length with its trait:  innings and moonset

Hint 4: Afield and heists, as well as several other words, have a related property.  The word sinning has yet another, if you’re British.

Hint 5: the traits of these words are related but each differs from the others except as indicated in Hints 3 and 4. There are multiple shorter words that share the same traits with all of these.

Go ahead and put your guess in the comments section.