Synonyms for Every day:

adv.

day after day (adverb)
daily, regularly.

n.

always (noun)
habitually, all the time, regularly, frequently.
every day (noun)
each day, day after day, day-to-day, daily, regular.

Other synonyms:

day-after-day
day after day.
Other relevant words:
habitually, all the time, regularly, frequently.