Nouns

(n)eclipse, occultationone celestial body obscures another

Verbs

(v)overshadow, dominate, eclipsebe greater in significance than“the tragedy overshadowed the couple's happiness”
(v)eclipse, occultcause an eclipse of (a celestial body) by intervention“The Sun eclipses the moon today”, “Planets and stars often are occulted by other celestial bodies”