The Early Qenya Grammar (EQG) of the 1920s had ᴱQ. kan(ta)kainen “forty” as a combination of ᴱQ. kanta “four” and ᴱQ. kainen “ten” (PE14/49, 82).
Neo-Quenya: Late in Tolkien’s life, Tolkien changed the Quenya word for “ten” to quëan or quain, which has been the basis for various neologisms for “forty”: ᴺQ. canaquëan, ᴺQ. canaquain, or ᴺQ. canquain. I prefer to use ᴺQ. canquain for purposes of Neo-Quenya.
A variant word for “thousand” from the Early Qenya Grammar (EQG) of the 1920s as a combination of ᴱQ. tuksa “hundred” and ᴱQ. kainen “ten”, following the pattern of words like ᴱQ. kan(ta)kainen “forty” (PE14/50, 83). Properly it is tuksa kainen, shortened to either tuksakainen or tuksainen. Compare ᴱQ. húme “thousand”.