As verbs the difference between stilled and spilled
is that stilled is past tense of still while spilled is past tense of spill.
As an adjective stilled
is brought to a standstill.
stilled
English
Adjective
(head)
brought to a standstill
quieted
Verb
(head)
(still)
spilled
English
Alternative forms
* spilt (qualifier)
Verb
(head)
(chiefly, US) (spill)