explorer:
(plural: ‘explorers‘; pronunciation: the first ‘e’ rhymes with the letter ‘i’ in “pit” and the letter ‘x’ rhymes with the letter ‘k’ in “kick”)

Marco Polo, one of the greatest explorers
a person who travels into or through a new place for the purpose of discovering (finding out/explore) new things, places and people;
an adventurer;
a person takes risks and uses dishonest or illegal methods to get what he/she wants;
(always with a capital ‘E’, Explorer, & mostly in American usage) a boy or young man aged between 14-20 who participates in the exploring programmes of the Boy Scouts of America,

David Livingstone, one of the greatest explorers, explored parts of Africa
My nephew goes into every room and tries to examine everything he sees there, which is quite natural for any toddler, but my sister believes that her son is going to be a great explorer in the future!
There have been numerous explorers of every kind — explorers on land, in air and on and under the sea — who have explored new and dangerous zones overcoming natural barriers, making the world and even the universe smaller and smaller.
The modern day explorers focus their efforts mostly on space and under-sea explorations — the astronauts and astronomers are the space explorers and the marine biologists and diving enthusiasts are the undersea explorers.
More and more explorers are budding up by the day doing dangerous and unnatural deeds/stunts in order to get into the media limelight over-night!

a troop of Scout Explorers on an exploration
