Train, air plane and spaceship,
Reptile, bird and roc,
Low, high and higher,
Transport, explore,
Accessible, beyond reaching
Common, rare, most advanced,
explore investigate survey analyze, into, dig into, examine, go into, have a look, hunt, inquire into, inspect,
leave no stone unturned, look into, probe, prospect, question, research, scout, scrutinize, search, seek, sift, test, tour, travel, traverse, try,
Discover find, uncover Synonyms: ascertain, bring to light, catch, come across, come upon, conceive, contrive, debunk, design, detect, determine, devise, dig up, discern, disclose, distinguish, elicit, espy, explore, ferret out, glimpse, hear, identify, invent, learn, light upon, locate, look up, notice, observe, originate, perceive, pick up on, pioneer, realize, recognize, reveal, see, sense, smoke out, spot, think of, turn up, unearth
