After browsing different online electronic stores, I got a little bit confused with crystals...

1. What's the proper name for this: en.wikipedia.org/wiki/File:16MHZ_Crystal.jpg Crystal? Quartz crystal? Resonator? Quartz crystal resonator? Oscillator? Crystal Oscillator?

2. This one have the same function as what I posted on #1 but less accuracy and stability?
   Is it called Resonator? Ceramic resonator? Ceramic crystal? Oscillator?

3. This is the same as #2 but have two ceramic capacitors built in? So what do you call it?

4. What do you call these:
   

5. This is the schematic symbol for #1? upload.wikimedia.org/wikipedia/commons/c/cb/Crystal-oscillator-IEC-Symbol.svg What about for #2, #3 and #4?

6. This is a crystal oscillator? Can I replace The "Crystal" with #2/#3/#4??