supplementally

In added fashion

In a supplemental manner—as an addition to something already existing or established.

The word functions as an adverb form of supplemental, though it appears rarely in practice: The document was filed supplementally after the initial submission.

Most writers prefer "as a supplement" or simply rephrase.

additionally

furthermore

Word adding more points

besides · too · likewise · further · plus · as well · in addition · extra · more · else

supportively

bolster

Strengthen or buttress

strengthen · fortify · buttress · sustain · uphold · aid · assist · help · support · shore up

Opposites
addition vs. primary role

supplementallyprimarily

In the first place

mainly · principally · chiefly · fundamentally · essentially

inclusion vs. exclusion

supplementallyexclusively

Only, nothing else

solely · instead · alternatively

completeness

supplementallycompletely

To the fullest extent

wholly · fully · entirely · sufficiently · adequately

Phrases
Family

supplemental

Familiarity
Top 1,000,000
Profile
Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G