Clear up chromosome terminology

[NiCKEL]

I'd like to finally clear up some confusion on chromosomes...I think I understand but I get a lot of questions because I'm getting one of the best marks and I'd like to give solid answers 

Basically plz check if I'm right-

 

Chromatin - spaghetti looking mess of DNA when not in mitosis (interphase) 

 

Chromosome - a dot (centromere) and 2 lines, I shape

Chromosome (after S phase) - a dot and 4 lines, X shape

 

Sister chromatids (after S phase) - a dot and 4 lines, X shape

[sister] chromatid (after S phase) - a dot and 2 lines, I shape

 

 

 

In a karyogram, it's showing a pair of X shaped chromosomes. Is that what it looks like after S phase, because after meisosis a "dot-and-2-lines" thing is in each of the 4 haploid cells. 

 

These words...