Englishfor English speakers
reliable
Adjective
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Something or someone that is reliable can be trusted or believed .
I told you computers are reliable, they finished the task in just 10 minutes when we took 5 hours for!
Gideon is very reliable if he says he'll do something, he'll do it.!
replacement
Noun
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A replacement is something that stands in for something else.
I'll be the replacement security guard for the guy who quit.
Here is the replacement gadget for the one you lost.
warhead
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noun
the front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents