What is the difference between these words?

Salvete. I am needing to know the differences between the words “marita”,“vxor”,et “conivx”.In my books, “Latin and the Romans” uses “marita”, sed “Latin for Americans” et “Using Latin” uses the word “uxor”. I know that “marita” is 1st declension et “vxor” et “conivx” are both 3rd declension. Maybe “conivx” is a literary word? Also,I know the full declensions for "“marita” (a no-brainer since it is 1st dec./feminine) and for “vxor” sed I can’t seem to find the full declension for “conivx”. Could someone please help straighten out the differences in these words for me et possibly give me the full declension for “conivx”? Thank you in advance. Valete.

“Una lingua numquam satis est.”

marita:

http://perseus.uchicago.edu/cgi-bin/philologic/getobject.pl?c.11:630.lewisandshort

uxor:

http://perseus.uchicago.edu/cgi-bin/philologic/getobject.pl?c.19:434.lewisandshort

coniux is usually spelled coniunx. It’s third declension and the genitive is coniugis:

http://perseus.uchicago.edu/cgi-bin/philologic/getobject.pl?c.2:4445.lewisandshort

Nom. coniunx coniuges
Gen. coniugis coniugum
Dat. coniugi coniugibus
Acc. coniugem coniuges
Abl. coniuge coniugibus

Thank you so much for your reply. You have helped me immensely.