We don't have synonyms for tephillah yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are tephillin, kehillah and tefillah.
(n) :
Alternative form of tefilla. [(countable, often in the plural) Synonym of phylactery (“either of two small leather cases containing scrolls with passages from the Torah, traditionally worn by a Jewish man (one on the arm (usually the left) and one on the forehead) and now sometimes by a woman at certain morning prayers as a reminder to obey the law as set out in the Bible”).]
(n) :
Alternative form of tefilla. [(countable, often in the plural) Synonym of phylactery (“either of two small leather cases containing scrolls with passages from the Torah, traditionally worn by a Jewish man (one on the arm (usually the left) and one on the forehead) and now sometimes by a woman at certain morning prayers as a reminder to obey the law as set out in the Bible”).]