- when
- than
- whereupon
- then
- less'n
- but then
- sithen
- unlessen
- rather than
- wherein
- hyphen
- if and when
- wherethan
- not to mention
- for-than
- ifen
- iffen
- if'n
- forthan
- wen
Note: these words have been obtained from Wiktionary and have been classified and improved through automated computer linguistics processes.