Word: Pentecostalist
Part of speech: Noun
Syllables: pen
te
co
sta
list
Definition: A member of the Pentecostalism movement.
Morphemes:
Affix: Pentecost
Language: en
PoS: Proper noun
Meaning: Proper noun~ Pentecostal manifestation, such as in a church service.
Etymology Compounds: Affix: πεντηκοστή
Language: grc
Decoded: pentekoste
Meaning: fiftieth 
Affix: -al
Language: en
PoS: Suffix
Meaning: Forming nouns, especially of verbal action.
Affix: -ist
Language: en
PoS: Suffix
Meaning: one who subscribes to a particular theological doctrine or religious denomination;
Etymology Compounds: Affix: -ίζω
Language: grc
Decoded: -izo
Meaning: -ize, -ise
Affix: -τής
Language: grc
Decoded: -tes
PoS: Suffix
Meaning: With -ύζω verbs.