This all depends on which branch of the military you are talking about.
In the Army, Air Force, & Marines the term "Captain" is typically interchangeable with the term "Commander." A Captain typically commands a company-sized element. Of course, there are also Battalion, Brigade, and Division Commanders as well who are much higher in rank than Captain.
2LT/O1 = 2nd Lieutenant ENS/O1 = Ensign
1LT/O2 = 1st Lieutenant LTJG/O2 = Lieutenant Junior Grade
CPT/O3 = Captain LT/O3 = Lieutenant
MAJ/O4 = Major LCDR/O4 = Lieutenant Commander
LTC/O5 = Lieutenant Colonel CDR/O5 = Commander
COL/O6 = Colonel CAPT/O6 = Captain
In the Navy a Captain outranks a Commander as described above.
A naval commander is lower rank than a naval captain, but higher than an army captain
A Naval Commander is equivalent to the air force captain
The rank of Admiral is higher than the rank of Captain.
Yes.In Navy commander has higher rank than lieutenant.
Yes, Captain is a higher rank than Lieutenant.
A Navy Commander has a higher military rank (O-5), than an Army Major (O-4).
A Captain is always higher than a Lieutenant
In the US Army and Airforce, a Major is one rank higher than a Captain. In the US Navy a Rear Admiral lower half (1 Star) is one rank higher than a Captain.
Yes. A Captain is a higher rank, universally.
Yes. A commander in the Navy is equivalent to Lt Colonel in the Army. The lowest rank of general is 2 ranks higher than the commander.