Thanks, that led me to this intriguing origin story from Christine Peterson, involving some advanced people skills: (my italics)

"Between meetings that week, I was still focused on the need for a better name and came up with the term "open source software." While not ideal, it struck me as good enough. I ran it by at least four others: Eric Drexler, Mark Miller, and Todd Anderson liked it, while a friend in marketing and public relations felt the term "open" had been overused and abused and believed we could do better. He was right in theory; however, I didn't have a better idea... Later that week, on February 5, 1998, a group was assembled at VA Research to brainstorm on strategy. Attending – in addition to Eric Raymond, Todd, and me – were Larry Augustin, Sam Ockman, and attending by phone, Jon "maddog" Hall... Todd was on the ball. Instead of making an assertion that the community should use this specific new term, he did something less directive – a smart thing to do with this community of strong-willed individuals. He simply used the term in a sentence on another topic – just dropped it into the conversation to see what happened.... A few minutes later, one of the others used the term, evidently without noticing, still discussing a topic other than terminology. Todd and I looked at each other out of the corners of our eyes to check: yes, we had both noticed what happened... "

https://en.wikipedia.org/wiki/Christine_Peterson

Stallman is about Free/Libre Software.

Eric S. Raymond is about Open Source.

There are somewhat subtle, but very important differences between their philosophies.

And not even all Free Software is the same.

Eg the Linux kernel deliberately uses GPL 2, and that community has rejected GPL 3.