Not a cactus, but you're very right is a Euphorbia. I don't think it's E. enopla. Thats a thinner plant. Maybe Euphorbia pentagona:). This is were it gets confusing because I see pentagona and enopla get sometimes confused as the same plant, but enopla I have and is thinner. From what I've read pentagona has 5-6 ribs. Where enopla has 6-7 ribs. From what I can see yours has about five. So I'm going with E. pentagona;). There is Euphorbia ferox, but I have that one and it's more rotund;). Oh ya I have to let you know because I would have a guilty conscience if I didn't. When cut or bump this plant will ooze a white fluid. Reminds me of watered down Elmer's glue. This is toxic so keep off skin and away from mucous membranes:). People have gone to the ER because of this stuff. Where your PPE. There you have been warned;).

Definitely would say a Stenocereus, but the spines are different from Stenocereus pruinosus:). I'm thinking it's Stenocereus weberi. It's a beautiful cactus!

The “nipple” type cactus are so hard to id. Most the time when I see cactus like this my brain goes straight to Mammillaria, but I see more Coryphantha in yours. There’s also Escobaria. Hopefully it’ll bloom fairly soon for you. If blooms come from the top you’ve got a Coryphantha or Escobaria, but if the flowers come from older side growth it’s a Mammillaria. I’ve read the only way a person can tell the difference between Escobaria and Coryphantha is the seeds.

Top is an Opuntia. Looks like an Opuntia I see at Home Depot that’s called Johnson’s hybrid. Pretty sure I’ve got the same cactus and that’s what the tag said Johnson’s hybrid. Not that that helps any. A hybrid between what Opuntias? Bottom is some type of Cylindropuntia. Looks to be Austrocylindropuntia cylindrica. The flower looks right for that id.