At close range and Head-on

At close range adverb - Very close.

Head-on and at close range are semantically related. In some cases you can use "Head-on" instead an adverb phrase "At close range".

Head-on adverb - In direct confrontation or competition.

At close range and head-on are semantically related. Sometimes you can use "At close range" instead an adverb phrase "Head-on".