G4845–συμπληρόω–sumplēroō

But as they sailed, he fell asleep: and there came down a storm of wind on the lake; and they were filled with water, and were in jeopardy.

συνεπληροῦντο suneplērounto “they were being swamped”

And it came to pass, when the time was come that he should be received up, he steadfastly set his face to go to Jerusalem,

συμπληροῦσθαι sumplērousthai “completing”

And when the day of Pentecost was fully come, they were all with one accord in one place.

συμπληροῦσθαι sumplērousthai “arriving of”