Suzuki suspension

Yes, it is a swivel joint, and they break internally regularly on Suzuki. (I don't get involved with the repairs) I always fail them for having excessive play.
Its rare to get both sides 'gone' at the same time so it's prety easy to make a comparison. They reveal the true extent of movement with the use of the heel-bar.

These aren't swivel joints,
Swivel joints are found on older type suspenstion designs such as the old Morris minor,Morris marina.
I do get involved in repairs and the set up you have here are King Pins ,upper and lower located on the hub by the 4bolts at the very top and bottom of the hub
The black round thing which the hub rotates round (call it a ball if you want) is the end of the differential .
When the king pins or wheel bearings wear badly,the seal around the ball can't make continuous contact and end up leaking oil which is diff oil.
With the axle jacked,use the heel bar under the wheel
An important point at this stage is have someone apply the foot brake as this will show any excess movement in the pins and prevents movement in the wheel Bering if it also has wear getting confused with each other.
The ball at the diff end really dosent do anything apart from providing protection for the drive shaft inside which also has a CV joint (similar as a front wheel drive vehicle )

if it was a jimny failure of the bottom bearing is common, when you strip it you`ll find the bearing covered in rust, water collects at the bottom and ruins it, also if its even a touch loose it gives a steering shake when braking, known fault and factory cure is a shim on the kingpin to preload the bearings, done load of the sods

Did the job today like you say they are like half shafts as there inside a casing and the top and bottom bearing just knock in like in a rear brake drum and that is were the play was. So in future what terminology would you suggest I use to fail these?