There are different levels of pastorship: Brother, Father, and Bishop, for example. It's most appropriate to refer to men in any of those positions as "Reverend", but to refer to them as Brother, Father, or Bishop is acceptible as well, although this is less formal. And yes, Catholics refer to their male parents as Father as well, although my own daughters have other names for me I'd rather not repeat.
The word host comes from an ancient latin reference meaning sacrifice (or the one who sacrifices himself). Host often referrs to the bread, but can mean the wine also. It is somewhat similar to our contamporary usage as the word "host" as the one who serves, as in the host of a banquet.
Because communion is celebrated every day in Catholicism, the informal communion celebrations involve simply the bread (though both bread and wine are present). In the more formal celebrations, communion involves both the bread and wine. The wine is usually distributed from a commun cup, or chalice (usually several). Each person takes a sip. A lay minister usually assists with the cup, wiping the rim and turining it slightly for the next person. However, it is not forbidden for the wine to be served in small cups, as is often the protestant fashion. In catholicism, only altar wine (wine made especially for communion) is used, there is no grape juice.
The biggest difference between Catholic communion and Protestant communion is that, in the RCC, people leave the pews to receive communion from a specific point in the church, while Protestantism usually distributes communion to a seated congregation in the pews.
As for the linguistic differences, much of the phraseaology is derived from Latin and Greek, while in Protestantism, it is often derived from more contemporary language (due in part to the cultural separation caused by the Protestant Reformation).
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