De or het spellingsuggestie?

The correct Dutch article is:

de spellingsuggestie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use spellingsuggestie

the spellingsuggestiede spellingsuggestie
this spellingsuggestiedeze spellingsuggestie
that spellingsuggestiedie spellingsuggestie
our spellingsuggestieonze spellingsuggestie
your spellingsuggestiejouw spellingsuggestie
every spellingsuggestieelke spellingsuggestie
which spellingsuggestie?welke spellingsuggestie?
a big spellingsuggestie / the big spellingsuggestieeen grote spellingsuggestie, de grote spellingsuggestie