Error running Terraform plan (can't call variable?)

$terraform plan    
Error:Error loading Desktop\terraform\network.tf:Error loading config for 
aws_internet_gateway [${var.GW_NAME}]:parse error at 1:11:expected"}"but 
found invalid sequence "$"

$ls-l
total34
-rw-r --r --1 takahashi.kazuki 197121 1298 February 14 17:52 network.tf ★ For network setup
-rw -r --r --1 takahashi.kazuki 197121 1536 February 14 17:48 prod.tfvars ★Production Variables
-rw-r --r --1 takahashi.kazuki 197121 149 February 14 15:53 provider.tf ★ Provider Information
-rw -r --r --1 takahashi.kazuki 197121484 February 14 15:53 README.md
-rw -r --r --1 takahashi.kazuki 197121 1425 February 14 15:53 variables.tf　

$cat network.tf
resource "aws_vpc" "${var.VPC_NAME}" {
    cidr_block="${var.VPC_CIDR}"
    instance_tenancy="default"
    enable_dns_support="true"
    enable_dns_hostnames="false"
    tags{
      Name = "${var.VPC_NAME}"
    }
}

resource "aws_Internet_gateway" "${var.GW_NAME}" {
    vpc_id = "${aws_vpc.${var.VPC_NAME}.id}"
}

resource "aws_subnet" "${var.SUBNET1_NAME}" {
    vpc_id = "${aws_vpc.${var.VPC_NAME}.id}"
    cidr_block="${var.SUBNET1_CIDR}"
    availability_zone="${var.SUBMET1_AZZONE}"
}

resource "aws_subnet" "${var.SUBNET2_NAME}" {
    vpc_id = "${aws_vpc.${var.VPC_NAME}.id}"
    cidr_block="${var.SUBNET2_CIDR}"
    availability_zone="${var.SUBNET2_AZZONE}"
}

resource "aws_route_table" "${var.INTERNET_ROUTE}" {
    vpc_id = "${aws_vpc.${var.VPC_NAME}.id}"
    US>route{
        cidr_block="${var.INTERNET_ROUTE_CIDR}"
        gateway_id="${aws_Internet_gateway.${var.GW_NAME}.id}"
    }
}

resource "aws_route_table_association" "${var.SUBNET1_NAME}" {
    subnet_id = "${aws_subnet.${var.SUBNET1_NAME}.id}"
    route_table_id = "${aws_route_table.${var.INTERNET_ROUTE}.id}"
}

resource "aws_route_table_association" "${var.SUBNET2_NAME}" {
    subnet_id = "${aws_subnet.${var.SUBNET2_MAME}.id}"
    route_table_id = "${aws_route_table.${var.INTERNET_ROUTE}.id}"
    }

$cat prod.tfvars
########
## network.tf
VPC_NAME="tf-test-network"
VPC_CIDR="192.168.0.0/16"
GW_NAME="tf-test-internet-gw"
SUBNET1_NAME="prod-tf-test-subnet-1a" #this subnet in ap-northeast-1a for Internet
SUBNET1_CIDR="192.168.10.0/24"
SUBNET1_AZZONE = "ap-northeast-1a"
SUBNET2_NAME="prod-tf-test-subnet-1c" #this subnet in ap-northeast-1c for Internet
SUBNET2_CIDR="192.168.110.0/24"
SUBNET2_AZZONE = "ap-northeast-1c"
INTERNET_ROUTE = "prod-tf-test-internet-route"
INTERNET_ROUTE_CIDR = "0.0.0.0/0"

$cat variables.tf
########
## network.tf
variable "VPC_NAME" {}
variable "VPC_CIDR" {}
variable "GW_NAME" {}
variable "SUBNET1_NAME" {}#this subnet in ap-northeast-1a for Internet
variable "SUBNET1_CIDR" {}
variable "SUBNET1_AZZONE" {}
variable "SUBNET2_NAME" {}#this subnet in ap-northeast-1c for Internet
variable "SUBNET2_CIDR" {}
variable "SUBNET2_AZZONE" {}
variable "INTERNET_ROUTE" {}
variable "INTERNET_ROUTE_CIDR" {}