Astroknot

astroknot \ˈas-trə-ˌnȯt\
noun.

1. a match made in heaven
2. a marriage, which, if not fueled enough, may come crashing down


NOTE:
The two almost contradictory meanings have been known to have caused more than one rifts. The fact that the word also has a homophone, hasn't helped. Humorous situations are left as an exercise for the reader