upstairs vs. up stairs etc.

[good ol' Bob]

Is there a word or term for the use or misuse of words such as up stairs or
never the less etc. when one should be using upstairs or nevertheless etc.
I often see posters on various groups make the mistake of using separate
words when the combination of those words forms the word they meant to or
should have used. Just curious.

Thanks if anyone knows.

[loki harfagr]

Post by good ol' Bob
Is there a word or term for the use or misuse of words such as up stairs
or never the less etc. when one should be using upstairs or nevertheless
etc. I often see posters on various groups make the mistake of using
separate words when the combination of those words forms the word they
meant to or should have used. Just curious.

b0rken'n'glish ;-)