Answer:

ser

Answer	Crossword Clue
SER	Sun. talk
SER	Rev.'s address
SER	Sun. delivery

SER	Sun. lecture
SER	Sun. words
SER	... Pounce (cat in "Game of Thrones")
SER	MLK delivery, e.g.
SER	Speech taking place while I'm still asleep on Sun. morning
SER	Sunday church delivery: Abbr.
SER	Sun. address
SER	Sunday talk (abbr.)

SER	To be (Sp.)
SER	Sun. oration
SER	Talk on Sun.
SER	Address of a Rev.
SER	Sun. discourse
SER	Sun. speech
SER	Sabbath msg.
SER	Spanish 101 verb

SER	To be, in Tijuana
SER	Sun. homily
SER	Speech on Sun.
SER	King delivery: Abbr.
SER	Inspiring msg.
SER	Uplifting talk: Abbr.
SER	Church wds.
SER	Mount msg.

SER	Rev.'s talk
SER	Sabbath speech: Abbr.
SER	Sun. worshipers' salve
SER	Rel. discourse
SER	Rev.'s message
SER	Sun. exhortation
SER	Sun. message
SER	Talk about sin, perhaps: Abbr.

SER	Inspiring dely.
SER	Mount discourse: Abbr.
SER	Sin thesis: Abbr.
SER	Bib.-based message
SER	Church msg.