different between primers vs concealers

primers

primers From the web:

• what primers for 223
• what primers for 9mm
• what primers for 6.5 creedmoor
• what primers for 308
• what primers are used in pcr
• what primers for 300 blackout
• what primers for 45 acp
• what primers for 300 win mag

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concealers

concealers From the web:

• what concealers are non comedogenic
• what concealers are oil free
• what concealers are good
• what concealers are water based
• what concealers don't crease
• what concealers do models use
• concealer shade
• what are concealers used for