genre or movement?

I was challenged to explain what I mean by "genre" and how it's different from a "literary movement". So, is modernismo a genre? A movement? Or what? Some theorists talk about genre as form - as poetry, drama, prose; elegy, epic, lyric. Then there's another way of talking about genre or subgenre, or "historical genres": science fiction, gothic romance, realist painting. And if a literary movement is some people copying each other to do something a new way, or a particular way, and create a different frame of reference of aesthetic judgement, how is that different from inventing a genre -- a body of work that shares some particular characteristics?

Or, think of it this way... a sonnet is a form, not a genre. But we could talk about a historical genre of "courtly love poetry" which often uses sonnet form. Or one could talk about a genre of writing about "courtly love" which would include various form-genres like poetry and exchanges of letters.

So am I way off base in using that word to talk about modernismo as a genre? And suggesting a countergenre? "Movement" doesn't fit, and I'm trying to talk about the beginnings of decisions about canonicity... though I suppose you can talk about being canonical within a particular movement. But how critics/poets decide who's in the movement and who isn't is quite suspect. So if a movement depends on traceable connections between writers, and I'm reframing rather than proving connections, I don't feel like "movement" is the right word. Plus - it makes me think of going to the bathroom.