fully vs to the full

fully and to the full both are adverbs.

Word	Noun	Adjective	Verb	Adverb
fully	No	No	No	Yes
to the full	No	No	No	Yes

As adverbs, fully and to the full are synonyms defined as:

fully and to the full: to the greatest degree or extent; completely or entirely; (`full' in this sense is used as a combining form)

Other synonyms of fully include full.

fully (adverb)	to the full (adverb)
to the greatest degree or extent; completely or entirely; (`full' in this sense is used as a combining form)	to the greatest degree or extent; completely or entirely; (`full' in this sense is used as a combining form)
referring to a quantity
sufficiently; more than adequately