G4845–συμπληρόω–sumplēroō

But while they were sailing he went to sleep: and a storm of wind came down on the sea, and the boat became full of water and they were in danger.

συνεπληροῦντο suneplērounto “they were being swamped”

And it came about that when the days were near for him to be taken up, his face was turned to go to Jerusalem,

συμπληροῦσθαι sumplērousthai “completing”

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

συμπληροῦσθαι sumplērousthai “arriving of”