Truly, my best friend forever is the thesaurus. I used to merely like it, but it has worked its way into my heart, become indispensable, and there it will remain as long as I keep writing. Admittedly, I'm stuck on the online version from Thesaurus.com, but, in the olden days, I was equally as familiar with my copy of Roget's Super Thesaurus by Marc McCutcheon. You can see the Super Thesaurus in the photo on the left, I've had it since it was first published in 1995, there is now a 4th edition available.) I also had another thesaurus from the 1940s. Why, you ask, did I use a 70 year old thesaurus? Because, I found it handy when I was working on Kids of the Homefront Army: Poems of World War II America. Language has definitely changed!
As I get older, when I'm writing, I find a lot of words clinging to the tip of my tongue. The thesaurus helps me to shake them loose.
So, do you have a BFF reference source you're dependent on?
From here, head over to Tabatha Yeatts: The Opposite of Indifference to meet more poetry friends.