West Indies 292 (Chase 70, Reifer 53, Nyauchi 5-56, Mavuta 3-73) beat Zimbabwe 115 (Kaia 38, Motie 7-37, Holder 2-18) and 173 (Ervine 72, Kaia 43, Motie 6-62) by an innings and 4 runs
Play started late on day three due to a wet outfield and once it did, Nyauchi made an instant impact, getting Jason Holder to nick off with the first delivery of the day.
Motie, the other overnight batter, soon became Nyauchi's fifth victim as he found deep midwicket with a pull as West Indies added just two runs to their total, taking a 177-run lead. It was Nyauchi's first five-wicket haul in Tests.
For the second time in the match, Kaia was off the blocks quickly, hitting three fine strokes for boundaries in the first two overs. But Alzarri Joseph gave West Indies the first breakthrough in the third over as Tanunurwa Makoni edged behind, looking to play an expansive drive.
Then, the first bowling change brought a wicket, with Chamu Chibhabha chopping on off Holder's bowling in the seventh over.
Kaia, Zimbabwe's best batter in the first innings, continued to chip away at West Indies' lead, even hitting Holder for three consecutive boundaries.
Ervine held down one end as Kaia scored 30 of the 41 runs that they made for the third wicket.
When Motie came out to bowl, Kaia immediately started attacking him with the sweep, but looked less in control than he was against the pacers. Kaia and Ervine saw Zimbabwe reach lunch at 46 for 2. In the third over after lunch, Kaia finally fell to the sweep, as he got a thin top edge that Joshua Da Silva held on to after a small juggling act.
He fell seven runs short of a half-century, after being dismissed for 38 in the first innings.
Ervine then shed his defensive approach to keep the scoreboard ticking, even as Motie castled Milton Shumba and Tafadzwa Tsiga in quick succession to complete his first Test 10-wicket haul.
Gabriel further dented Zimbabwe's ambitions when he got one to sneak under Donald Tiripano's bat to uproot the off-stump.
Ervine then brought up his half-century off 73 deliveries with a reverse-sweep off Motie.
Motie soon struck again as Wellington Masakadza gifted a simple catch to forward short leg as he came out of the crease to defend.
West Indies would have hoped to wrap things up quickly, but Ervine and Brandon Mavuta held firm to see Zimbabwe reach 158 for 7 at tea, with the deficit whittled down to 19 runs.
Zimbabwe then took seven off the first over after tea, bowled by Joseph, to bring the deficit down to 11 runs. But Chase had Mavuta caught at forward short leg with the first ball of the next over to give West Indies another opening.
Motie came back into the attack immediately and was quick to wrap the game up.
He trapped Ervine lbw for 72 - Zimbabwe's highest score in the match - as he played back to a length ball that spun in and stayed low before getting the ball to spin past an advancing Nyauchi for Da Silva to complete a simple stumping.