Toilet is a place which usually have commodes, urinals and a wash basin. It may not have other things like shower/bath tub. The small booth like things in beaches or small food stations are example of toilets.
Bathroom is where toilet and bath equipment are present like shower/bath tub. Hotel and houses have these. So a personal house will have a bathroom.
Restrooms are large toilets with multiple toilets and urinals and wash basins in one single room. Example: Offices and railway stations/airports have these.
Toilet（トイレ）は、通常、トイレ、便器、洗面台がある場所です。
シャワー/バスタブのような他のものがないかもしれません。
ビーチや小さなフードステーションのような小さなブースにあるものもトイレの一例です。
Bathroom（バスルーム）には、シャワー/バスタブのようなトイレとお風呂の設備があります。
ホテルや家にはそういったものもあります。
だから、個人の家にはバスルームがあります。
Restrooms（トイレ）は大きなトイレで、複数のトイレと小便器、洗面台が1つの部屋にあります。
例: Offices and railway stations/airports have these.
（オフィスや鉄道駅/空港には、こういったのがあります）
"Restroom" refers to the room in a public building for people to relax or recover in.
However, in the Philippines,
Filipinos usually call it the "CR" which means "Comfort Room".
"CR" is actually a Philippine English term.
In the UK, we would normally just ask for the toilet. You may also say, 'WC' or 'cloakroom. 'The Gents' is a toilet facility for men. 'The Ladies' is a toilet facility for women.
"The little boys'/girls' room." This is a jokey way of saying 'the toilet.'
イギリスでは普通 "toilet"と言います。
また 'WC' や 'cloakroom 'と言う事も出来ます。
'The Gents' は男性用トイレ
'The Ladies' は女性用トイレになります。
"The little boys'/girls' room."
これはトイレの冗談めかした言い方です。
A toilet is a large bowl with a seat, or a platform with a hole, which is connected to a water system and which you use when you want to get rid of urine or faeces from your body.
In a restaurant, theater, or other public place, a restroom is a room with a toilet for customers to use.
examples
"Can you tell me where the toilet is".
or
"May I use the bathroom".
or
"Is there a WC anywhere near".
WC is a very old-fashioned word for toilet or bathroom.
People usually say they are looking for the bathroom or toilet.
【例】
"Can you tell me where the toilet is?"
(トイレはどこにありますか)
"May I use the bathroom?"
(トイレ借りてもいいですか)
"Is there a WC anywhere near?"
(この近くにトイレありますか)
「WC」は「トイレ」のすごく古い言い方です。
普通は「bathroom/toilet はどこですか」のように言います。
Toilet = Very direct and easy way to get your point across. It is said in English speaking countries but in America it sounds a bit awkward to say you're going to the toilet. In America it is more common to say "bathroom" or "restroom"
Restroom = Common way to say the room where the toilet is.
Ladies (or) Men's room= Many people say this depending on what gender you are, so if you are a woman you would say "I would like to go to the ladies room" and it will be seen as a very normal way to say you need to use the toilet.
Toilet =直接的で、とても簡単な言葉です。英語圏の色々な国で使われますが、アメリカでは、トイレに行くというときに、toiletという単語はあまり使いません。bathroomやrestroomが一般的です。
Restroom = トイレのことをいう一般的な表現です。
Ladies (or) Men's room=性別によってこのように言う人も少なくありません。もしあなたが女性なら、"I would like to go to the ladies room" （トイレに行きたい）ということができます。
Toilet,wc,restroom. All acceptable words to use.
More casual forms are ladies and gents, although certain places now have mixed sex facilities.
In a more formal setting eg a meeting or company training a break would usually be called a comfort break
The most common would would be a "toilet," which is the device where you pee or poo whereas a restroom is the actual room where you would normally find toilets. Lastly in some places of the world you might see this named a, "WC," which stands for, "water closet."
南アフリカ 
フィリピン 
イギリス 
アメリカ合衆国 
