activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    tools:layout_editor_absoluteY="81dp">

    <EditText
        android:id="@+id/edWord"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginTop="65dp"
        android:layout_marginBottom="27dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="Enter Word"
        app:layout_constraintBottom_toTopOf="@+id/progressBar"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/edButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="54dp"
        android:layout_marginBottom="44dp"
        android:text="ENTER"
        app:layout_constraintBottom_toTopOf="@+id/edString"
        app:layout_constraintEnd_toStartOf="@+id/progressBar"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edWord" />

    <TextView
        android:id="@+id/edString"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="6dp"
        android:layout_marginEnd="6dp"
        android:layout_marginBottom="3dp"
        android:text="Word"
        app:layout_constraintBottom_toTopOf="@+id/edSimilar"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edButton" />

    <TextView
        android:id="@+id/edSimilar"
        android:layout_width="0dp"
        android:layout_height="251dp"
        android:layout_marginStart="6dp"
        android:layout_marginEnd="6dp"
        android:layout_marginBottom="8dp"
        android:text="Similar Words"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/edString" />

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyle"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginEnd="141dp"
        android:layout_marginBottom="299dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/edButton"
        app:layout_constraintTop_toBottomOf="@+id/edWord" />
</android.support.constraint.ConstraintLayout>