British and other Commonwealth English use the ending "-logue" while American English commonly uses the ending "-log" for words like "analog(ue)", "catalog(ue)", "dialog(ue)", "monolog(ue)", "homolog(ue)", etc. The "-gue" spelling, as in "catalogue", is used in the US, but "catalog" is more common. Additionally, in American English, "dialogue" is an extremely common spelling compared to "dialog", although both are treated as acceptable ways to spell the word (thus the inflected forms, "cataloged" and "cataloging" vs. "catalogued" and "cataloguing"). Words like "demagogue", "pedagogue", and "synagogue" are seldom used without "-ue" even in American English.